CEC Review Course Final Exam

CEC-1     Calculate the total net cut for the following using the Average End Method:

CEC-2     One end of an excavation is at station 1+00 and has a cross-sectional area of 82 sqft. The middle of the excavation is at station 2+50 and has a cross-sectional area of 297 sqft. The end of the excavation is at station 4+00 and has a cross-sectional area of 0 sqft. What is the total net cut for this site?

CEC-3     Calculate the swell factor for a borrow pit with a dry bank weight of 20,000 lbs and a dry loose unit weight of 18,000 lbs.

CEC-4     Elevation 2 = 137.97 ft, Survey Pole 2 reading = 12.06 ft, and Survey Pole 3 reading = 21.48 ft. What is Elevation 3?

CEC-5     On an Earthwork Mass Diagram, a Balance Point is:

CEC-6     Repetitive layering in metamorphic rocks caused by shearing forces (pressures pushing different sections of the rock in different directions), or differential pressure (higher pressure from one direction than in others) is a __________.

CEC-7     The soil in a 100 ft x 100 ft x 10 ft deep excavation has a swell factor of 21% and a shrinkage factor of 17%. How much backfill soil will be required in LCY?

CEC-8     How many standard concrete blocks (7-5/8” x 7-5/8” x 15-5/8”) are required to build a wall 10 ft high x 30 ft long? Mortar joints are to be 0.5”.

CEC-9     Estimate the cost to build a 10 ft x 41 ft x 1 ft retaining wall with the following:

• Concrete cost = $91.50/yd³
• Rebar cost = $4.97 per 10 ft piece
• Base drain = 4.15/ft
• Labor = $45/hr
• Concrete form rental = $150/day

The wall will require 160 pieces of rebar, 40 feet of base drain, 2 laborers, and 5 days form rental. Laborers work 8 hours/day for 5 days.

CEC-10    A four-story office building built in Dallas, Texas in 2005 cost $5,750,500. What would that same building cost to build in 2015 if the historical cost indexes are 133.7 for 2005 and 160.2 for 2015.

CEC-11    Using Equivalent Uniform Annual Cost (EUAC), which of the following systems is the best choice is the annual interest rate is 3.1%?

CEC-12    Which of the following does not cause variations in productivity?

CEC-13    Determine the center of gravity (X, Y) for the following load. Neglect the depth.

CEC-14    If the Z dimension (of the load in CEC-13) is 30’ and the center of gravity is 15’ from the reference point, what is the Sling Angle Factor for sling arm L? The lifting point is 10 ft above the highest point of the load.

CEC-15    Determine the Toppling Moment for a crane lifting a 18000 lb load. The load is located 15 feet from the toppling point of the crane. The crane boom weighs 1500 lbs and is 27 feet long.

CEC-16    Use the crane in question CEC-15. The center of gravity of the counterweight is 9 feet from the toppling point. The crane weighs 27,500 lbs and the center of gravity of the crane is 8 feet from the toppling point. If the Toppling Factor of Safety is 2.0, how heavy is the counter weight?

CEC-17    Observation wells are drilled 17 feet and 25 feet away from a pumped well. After the system reaches equilibrium, a water level of 15 feet is recorded in observation well 1 and a water level of 19 feet is recorded in observation well 2. If the pump is removing 16.5 cuft/min from the pumped well, what is the hydraulic conductivity of the soil?

CEC-18    For a single, 3 ft diameter driven pile subjected to an axial load of 75 kips, determine the ultimate end bearing of the pile. The pile is 20 ft long steel with a plugged end. Use a factor of safety of 3.0.

• soil unit weight, g = 130 lbs/ft³
• cohesion, c = 750 lb/ft²
• angle of internal friction, f = 28°

CEC-19    For the pile in question CEC-18, determine the ultimate friction capacity of the pile.

CEC-20    For the pile in question CEC-18, determine the ultimate pile capacity.

CEC-21    For the pile in question CEC-18, determine the allowable bearing capacity. Is the pile capable of handling the imposed load?

CEC-22    In the CPM Schedule shown, activities K & L are no longer part of the project. Which path is the Critical Path?

CEC-23    Resource Leveling manipulates __________ based on resource constraints with the goal of balancing demand for resources with the available supply.

CEC-24    The objective of the Time-Cost Tradeoff analysis is to determine which activities to “crash” in order to produce the maximum overall job profit by finding the sweet-spot between increasing costs of specific activities and decreasing overall project costs. Which of the following could be manipulated in the Time-Cost Tradeoff analysis:
I.   overtime
II.  additional shifts
III. improved equipment
IV. reduced scope

CEC-25    Cement is one of the components of concrete. To produce cement, calcium carbonate must be thermally decomposed to produce __________ and __________.

CEC-26    Calculate the Plastic Limit of a soil sample with a wet weight of 9.1 gm and a dry weight of 7.9 gm.

CEC-27    The American Welding Society (AWS) publishes codes pertaining to welding requirements. According to the AWS, what are the three broad categories of welded construction documentation?
I.    Materials
II.  Weather conditions
III. Welding procedures
IV . Personnel Qualifications

CEC-28    Weekly construction progress meetings with the owner (or owner’s rep), the architect, the engineers, and the contractors would most likely be considered:

CEC-29    Concrete Proportioning is intended to ensure hardened concrete will have the required:
I.    Strength
II.  Wear resistance
III. Durability
IV. Finish

CEC-30    The Concrete Maturity Method (ASTM C1074) estimates the strength of concrete by monitoring the __________ of the concrete during its first stages of hardening.

CEC-31    The Soil Test that allows the sample and the pore pressures to fully consolidate (i.e., adjust) to the surrounding stresses is the __________ test.

CEC-32    Using the Rankine method, find the total earth pressure force on an 8 foot high retaining wall. The total unit weight of the soil is 131 pcf and has a friction value of 26 degrees.

CEC-33    Which of the following systems uses movable formwork to operate around the clock forming concrete?

CEC-34    Falsework consists of temporary structures used to support spanning or arched structures in order to hold the component in place until its construction is sufficiently advanced to support itself. Falsework also includes temporary support structures for:
I.    Formwork
II.   Scaffolding
III. Shoring

CEC-35    A concrete slab being formed using metal pans requires a system of shores until the concrete has attained a level of strength to support itself. The slab is 40 ft by 60 ft. The concrete is 4” thick and weighs 150 pcf. The pan system weighs 8 lbs/sf and the shores can support up to 1,000 lbs each. How many shores would be required?

CEC-36    The construction process used to strengthen the foundation of an existing structure is:

CEC-37    A temporary structure installed to provide a dry working environment for the construction of bridge piers is called a:

CEC-38    Correction of a safety or health hazard/violation that led to an OSHA citation is __________

CEC-39    According to OSHA, approximately 2.3 million construction workers frequently work on scaffolds. Protecting these workers from scaffold-related accidents would prevent an estimated _____ injuries and 50 fatalities each year.

CEC-40    According to OSHA, __________________ people are injured each year as a result of crashes in work zones.